APS Series

  1. Does the APS support both 120 VAC and 230 VAC.?
  2. Can multiple WTI units be Daisy Chained together?
  3. What kind of cable do I need, in order to connect my laptop or PC to a serial port on the APS unit?
  4. I have several pieces of equipment, which are operating at different baud rates. Do I need to set all of my equipment to a common baud rate in order to connect to the APS?
  5. I am using HyperTerminal and I can't talk to the APS unit. How should I configure HyperTerminal in order to allow me to communicate with the APS?
  6. How can I tell whether or not I am using the correct type of cable to connect my computer to the APS unit?
  7. Is the APS unit flash upgradeable?
  8. When I connect to a port, the buffer is full of failed login attempts from my equipment. How can I stop this from happening?
  9. I have an external modem connected to one of the APS serial ports. When I dial into that modem, and after the modems connect, I get a garbled response, also the APS does not respond to commands. How do I solve this? The following command should be added to the APS modem Initialization String of the port parameters.

APS Series Q & A

1. Does the APS support both 120 VAC and 230 VAC.?
Yes. On the APS-4, 8, & 16, there is a selector switch located on the back panel near the power plug. Move the selector switch to the desired power requirement.
NOTE: The APS-8M has an auto switching power supply
2. Can multiple WTI units be Daisy Chained together?
Yes. Use a NULL cable to connect the two units together. (Refer to WTI PN# NC9F9F NULL Cable). Make certain to change the LOG OFF CHARACTER for each unit in the daisy chain, so that no two units in the chain use the same Log Off Character Top of Page
3. What kind of cable do I need, in order to connect my laptop or PC to a serial port on the APS unit?
The serial ports on the APS series are DB9 DTE ports. A standard 9F to 9F null cable is required for computers that have a DB-9 serial interface. (Ref WTI p/n# NC9F9F)
4. I have several pieces of equipment, which are operating at different baud rates. Do I need to set all of my equipment to a common baud rate in order to connect to the APS?
No. Each port can be individually programmed for a different baud rate. Top of Page
5. I am using HyperTerminal and I can't talk to the APS unit. How should I configure HyperTerminal in order to allow me to communicate with the APS?
Select "File" from the HyperTerminal window task bar, then select "Properties" and then select the tab labeled "Settings" and set the terminal emulation to ANSI. The factory default communications configuration for the APS is 9600, N, 8, 1.
6. How can I tell whether or not I am using the correct type of cable to connect my computer to the APS unit?
First, use the /C command to create a connection with any APS serial port. Next, type a series of characters on your keyboard. If an appropriate cable has been used to connect your computer to the APS, the port activity LED for the connected port should flash as characters are typed on your keyboard. Top of Page
7. Is the APS unit flash upgradeable?
Although the APS firmware is not flash upgradeable, the unit is EPROM upgradeable. To request an upgrade, contact WTI service at 888-280-7227
8. When I connect to a port, the buffer is full of failed login attempts from my equipment. How can I stop this from happening?
Configure the port mode parameter, of the APS port in question, to PASSIVE mode. Note Port 1 and 2 cannot be configured for passive or buffer mode. Top of Page
9. I have an external modem connected to one of the APS serial ports. When I dial into that modem, and after the modems connect, I get a garbled response, also the APS does not respond to commands. How do I solve this? The following command should be added to the APS modem Initialization String of the port parameters.
The external modem, connected to the APS, requires a command to lock the modem serial port to a fixed baud rate. On a USR modem the command to fix the serial port is &B1. Refer to your modem user’s manual for the command to fix the serial baud rate of your particular model. Top of Page
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